Early versions highlighted contaminated drinking water and vulnerabilities from fracking. The final version turned out differently: Fracking had not "led to widespread, systemic impacts." Oil and gas cheered the findings.

When Danny Heinrich confessed in court on Sept. 6 to abducting and murdering Jacob Wetterling and assaulting Jared Scheierl 27 years ago, investigators declared that at last, the public had the truth. But despite Heinrich's excruciatingly detailed accounts, the truth remains elusive. Many questions remain unanswered.

Racial identity in the U.S. is complicated because race is an invented category rooted in slavery. This episode explores the question of black identity in America through the voices of four people who, at one time or another, have had to answer the question: "What are you?"

In November 2012, a police officer named Tom Decker was shot and killed in Cold Spring, Minn., after getting out of his car to check on a man who lived above a bar. The man was quickly arrested and held in the Stearns County jail. He was interrogated but then released without charges. The state crime bureau later ruled him out as a suspect. Investigators turned their focus to another man, Eric Thomes, who hanged himself before he could be charged with the crime. Nearly four years after the murder, Sheriff John Sanner has refused to close the case "because we're still hopeful that new information will come in," he said.